212340321 has 24 divisors (see below), whose sum is σ = 314902016. Its totient is φ = 137803680.

The previous prime is 212340281. The next prime is 212340343. The reversal of 212340321 is 123043212.

212340321 is a `hidden beast` number, since 2 + 1 + 2 + 340 + 321 = 666.

It is not a de Polignac number, because 212340321 - 2¹³ = 212332129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212340294 and 212340303.

It is not an unprimeable number, because it can be changed into a prime (212340391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143616 + ... + 145086.

Almost surely, 2^212340321 is an apocalyptic number.

It is an amenable number.

212340321 is a deficient number, since it is larger than the sum of its proper divisors (102561695).

212340321 is a wasteful number, since it uses less digits than its factorization.

212340321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 212340321 is about 14571.9017633252. The cubic root of 212340321 is about 596.5920885464.

Adding to 212340321 its reverse (123043212), we get a palindrome (335383533).

The spelling of 212340321 in words is "two hundred twelve million, three hundred forty thousand, three hundred twenty-one".